/*
   Copyright 2009 the original author or authors

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package com.googlecode.kohmori.springmvc;

import java.sql.Connection;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.ModelAndViewDefiningException;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class ReportHandlerInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, 
            Object handler) throws Exception {
        // Check if DB Connection available and open, if not redirect
        // to an error page.
        HttpSession session = request.getSession(true);
        Connection conn = (Connection) session.getAttribute("connection");
        
        if (conn != null && !conn.isClosed()) {
            return true;  // continue
        } else {
            ModelAndView modelAndView = new ModelAndView("error_invalid_access_url");
            throw new ModelAndViewDefiningException(modelAndView);
        }
    }
}
